Dalton Highway over Mid Fork Koyukuk River 1
Fair Condition54 years old140 vehicles/day
Location
| State | Alaska |
| County | Yukon-Koyukuk |
| Location | Mile Point 188.0 |
| Carries | Dalton Highway |
| Crosses | Mid Fork Koyukuk River 1 |
| Coordinates | 67.43769, -150.07869 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 333.0 ft (101.5 m) |
| Max Span | 60.0 ft (18.3 m) |
| Deck Width | 27.6 ft (8.4 m) |
| Deck Area | 852.6 sq m |
| Main Spans | 4 |
| Year Built | 1972 (reconstructed 1992) |
Traffic
| Avg Daily Traffic | 140 (2020) |
| Truck Traffic | 62% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 724 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 1261 |